tools/target_dec_fuzzer: Adjust threshold for WMV3

Fixes: Timeout clearing images
Fixes: 37726/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV3_fuzzer-4604669570187264

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

tools/target_dec_fuzzer.c

@@ -210,6 +210,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     case AV_CODEC_ID_VP9:         maxpixels  /= 4096;  break;
     case AV_CODEC_ID_WAVPACK:     maxsamples /= 1024;  break;
     case AV_CODEC_ID_WMV3IMAGE:   maxpixels  /= 8192;  break;
+    case AV_CODEC_ID_WMV3:        maxpixels  /= 1024;  break;
     case AV_CODEC_ID_WS_VQA:      maxpixels  /= 16384; break;
     case AV_CODEC_ID_WMALOSSLESS: maxsamples /= 1024;  break;
     case AV_CODEC_ID_ZEROCODEC:   maxpixels  /= 128;   break;